Dodge Durango

 Service Manual

Horn Systems » Description and operation
Horn system

DESCRIPTION

A dual-note electric horn system is standard factory- installed equipment on this model. The standard equipment horn system features one low-note horn unit and one high-note horn unit. The horn system uses a non-switched source of battery current so that the system will remain functional, regardless of the ignition switch position. The horn system includes the following components:

• Clockspring
• High-line Central Timer Module (CTM)
• Horns
• Horn relay
• Horn switch

Refer to Clockspring in the Description and Operation section of Group 8M - Passive Restraint Systems for more information on this component. Refer to Central Timer Module in the Description and Operation section of Group 8E - Instrument Panel Systems for more information on this component.

Refer to Horn/Cigar Lighter/Power Outlet in the Contents of Group 8W - Wiring Diagrams for complete circuit diagrams. Following are general descriptions of the remaining major components in the horn system.

OPERATION

The horn system is activated by a horn switch concealed beneath the driver side airbag module trim cover in the center of the steering wheel. Depressing the center of the driver side airbag module trim cover closes the horn switch. Closing the horn switch activates the horn relay. The activated horn relay then switches the battery current needed to energize the horns.

Refer to the owner's manual in the vehicle glove box for more information on the features, use and operation of the horn system.

CENTRAL TIMER MODULE

The high-line Central Timer Module (CTM) can also operate the horn system. A high-line CTM is used on high-line versions of this vehicle. The CTM combines the functions of a chime/buzzer module, an intermittent wipe module, an illuminated entry module, a remote keyless entry module, and a vehicle theft security system module in a single unit.

The high-line CTM also controls and integrates many of the additional electronic functions and features included on models with this option. The horn relay is one of the hard wired outputs of the CTM.

The high-line CTM is programmed to energize or deenergize the horn relay in response to certain inputs from the Remote Keyless Entry (RKE) system and/or the Vehicle Theft Security System (VTSS).

Refer to Central Timer Module in the Description and Operation section of Group 8E - Instrument Panel Systems for more information on the high-line CTM. Refer to Remote Keyless Entry System in the Description and Operation section of Group 8P - Power Lock Systems for more information on the RKE system. Refer to Vehicle Theft Security System in the Description and Operation section of Group 8Q - Vehicle Theft/Security Systems for more information on the VTSS.

Horn system

Horn

Horn relay

Horn switch